How do you tell individual chickens apart?

The AKC breed standard calls for a natural range of size, with a desired freighting weight of 75 to 85 pounds (34-38.5 kg) and a height of 23 to 25 inches (58-63.5 cm). Heavier individuals (100+ pounds) and dogs smaller than 75 pounds are common--there is often a marked size difference between males and females. Weights upwards of 140 pounds or more are occasionally seen; these dogs are uncommon and are produced primarily by breeders who market a "giant" malamute. These "giant" sizes are not in accordance with the breed's history or the AKC standard. The coat is a dense double northern dog coat, somewhat harsher than that of the Siberian Husky. The usual colors are various shades of grey and white, sable and white, black and white, red and white, or pure white. Eyes are almond-shaped and brown; blue eyes are sometimes found, but will disqualify the dog in shows. The physical build of the Malamute is compact with heavy boning. In this context 'compact' means that their height to length ratio is fairly even, unlike dogs like Great Danes which are longer and lankier in their ratios.